package api;

import com.fasterxml.jackson.databind.ObjectMapper;
import modl.User;
import modl.UserDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 86183
 * Date: 2023-03-23
 * Time: 9:42
 */
@WebServlet("/login")
public class LoginServlet extends HttpServlet {
    private ObjectMapper objectMapper = new ObjectMapper();

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf8");
        resp.setContentType("text/html;charset=utf8");
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        if(username == null || "".equals(username)||password == null || "".equals(password)){
            String html = "<h3>登录失败!缺少username或者password字段</h3>";
            resp.getWriter().write(html);
            return;
        }
       UserDao userDao = new UserDao();
        User user = userDao.selectByUsername(username);
        if(user == null){
            String html = "<h3>登录失败!用户名或密码错误</h3>";
            resp.getWriter().write(html);
            return;
        }
        if (!password.equals(user.getPassword())){
            String html = "<h3>登录失败!用户名或密码错误</h3>";
            resp.getWriter().write(html);
            return;
        }
        HttpSession session = req.getSession(true);
        session.setAttribute("user",user);
        resp.sendRedirect("blog_list.html");
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("application/json; charset=utf8");
        HttpSession session = req.getSession(false);
        if(session == null){
            User user = new User();
            String respJson = objectMapper.writeValueAsString(user);
            resp.getWriter().write(respJson);
            return;
        }
        User user = (User) session.getAttribute("user");
        if (user == null){
            user = new User();
            String respJson = objectMapper.writeValueAsString(user);
            resp.getWriter().write(respJson);
            return;
        }
        String respJson = objectMapper.writeValueAsString(user);
        resp.getWriter().write(respJson);
    }
}
